[Bug 63644] pinentry-qt character length limitation

[Ingo Klöcker]

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The "secure" memory handling in pinentry-qt is a really bad hack and=20
leads to crashes (which are actually "out of memory" failures) under=20
certain circumstances. For example depends the number of characters one=20
can enter before pinentry-qt runs out of memory on the widget style=20
that is used. IMO the only way to fix this is to not store the password=20
in a QString. Instead pinentry-qt has to store the password in a char*=20
because then this instable "secure" memory hack (which works around=20
QString features) is superfluous.

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